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WFPC2 Filters after 16 Years on Orbit

WFPC2 Filters after 16 Years on Orbit. P. L. Lim 1 , M. Quijada 2 , S. Baggett 1 , J. Biretta 1 , J. MacKenty 1 , R. Boucarut 2 , S. Rice 2 , & J. del Hoyo 2. 1 Space Telescope Science Institute 2 Goddard Space Flight Center. Motivations. Over 180k datasets during on-orbit operation

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WFPC2 Filters after 16 Years on Orbit

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  1. WFPC2 Filtersafter 16 Years on Orbit P. L. Lim1, M. Quijada2, S. Baggett1, J. Biretta1, J. MacKenty1, R. Boucarut2, S. Rice2, & J. del Hoyo2 1 Space Telescope Science Institute 2 Goddard Space Flight Center STScI Calibration Workshop 2010

  2. Motivations • Over 180k datasets during on-orbit operation • Improve science calibrations • In-band, red/blue leaks • Change in transmission, bandpass wavelength • Distribute new filter transmissions on WFPC2 website (approx. Oct 2010) • Publish results in Instrument Science Report STScI Calibration Workshop 2010

  3. Known Changes • F122M • 20-25% throughput drop (Biretta & Gonzaga 2008; private communications) • F160BW • Pinhole growth (WFPC2 ISR 2009-01) • F343N • 50% throughput drop (WFPC2 ISR 2009-02) • Most filter changes expected to be less than a few percent STScI Calibration Workshop 2010

  4. Filters of Interest • Known on-orbit changes • F122M, F160BW, F343N • High utilization • F300W, F450W, F555W, F606W, F675W, F702W, F814W, F850LP • Regular utilization • F255W, F336W, F439W, F502N, F656N, F658N, F673N • UV filters (red leak, pinholes) • F170W, F185W, F218W • Others • F130LP, F160AW, F165LP, F375N, F380W, F390N, F437N, F467M, F469N, F487N, F1042M, ramp filters STScI Calibration Workshop 2010

  5. Methods • Cosmetic inspections (completed) • Stains, spots, pinholes • Scan filter transmissions with spectrophotometer at GSFC • λ > 2000Å, Δλ ~ 0.5-50Å • Compare with pre- and in-flight data STScI Calibration Workshop 2010

  6. Five-Point Scan STScI Calibration Workshop 2010

  7. F343N 3432Å 3434Å • Confirms photometry results (Gonzaga & Biretta 2009) • λpeak ~ 2Å redder, FWHM ~ 3Å wider, uniform change STScI Calibration Workshop 2010

  8. F160AW, F160BW (Log scale) • AW → Not used in-flight due to pinholes • BW → Pinholes now worse than AW, spatially dependent • Will investigate when BW changes happened STScI Calibration Workshop 2010

  9. F450W (Log scale) • Consistent with pre- and in-flight data STScI Calibration Workshop 2010

  10. F170W (Log scale) • Red leak consistent with pre- and in-flight STScI Calibration Workshop 2010

  11. Summary • Goal is to improve science calibrations • Inspections and scans are performed • Early results are presented here • F343N, F160AW, F160BW, F450W, F170W • Work is on-going and expected to be published in Oct 2010 Thank you STScI Calibration Workshop 2010

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